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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a21f6af9324910bf455c5b6db457441e38777fad9fb574e5f8dfcb9b08fab7' 
  AND token = 'RGVlV5pIQnWIMkUpoWX0pI/a4X9VY4YgUsxo0OacEts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}